There's a new contender for the dumbest CEO crown: Robert Stiller, the now ex-chairman of Green Mountain Coffee Roasters. And the stupid mistake that cost him his job -- and a lot of money -- was an investing choice that you might be making too.

Simon Baker plays a not-quite-psychic sleuth on "The Mentalist" and a shady brokerage boss in the new film "Margin Call." But in real life, he's not trying to read the tea leaves of Wall Street to manage his money: His working class upbringing made him a very conservative money man.

The actor who stars in "Margin Call," a film about high finance confesses that he doesn't believe in investing, confesses his ignorance about "the system" and explains why he's taking up the Occupy Wall Street cause.